CODEWITHSUNDEEP
opencvhistogram
Karam Abo Ghalieh
Karam Abo Ghalieh

Reputation: 428

Histogram Matching

I am using calcBackProject to find an object in a frame and it works somehow well scanning all the frame. but I need to enhance it

In my code at some point I have a motion detection mask and based on it I generated contours for candidate objects (objects that move and might be the target)

could I utilise this to calculate histogram for each contour and match it to the histogram of the target?

Upvotes: 1

Views: 667

Answers (1)

Anonymous Coward
Anonymous Coward

Reputation: 3200

Convert your contour to a mask and use the mask in calcHist.
In C++ it would be done like this :

/**
 * Converts a contour to a binary mask.
 * The parameter mask should be a matrix of type CV_8UC1 with proper
 * size to hold the mask.
 * @param contour The contour to convert.
 * @param mask The Mat where the mask will be written. Must have proper size
 * and type before callign convertContourToMask.
 */
void convertContourToMask( const std::vector<cv::Point>& contour, cv::Mat& mask )
{
    std::vector<std::vector<cv::Point>> contoursVector;
    contoursVector.push_back( contour );
    cv::Scalar white = cv::Scalar(255);
    cv::Scalar black = cv::Scalar(0);
    mask.setTo(black);
    cv::drawContours(mask, contoursVector, -1, white, CV_FILLED);
}

Upvotes: 1

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